The objective of this project is to quantify the effect of meeting increasing freight demands with heavier trucks to reduce the growth in the number of trucks on the road. Specifically, the effect of heavier trucks on bridge infrastructure will be quantified with regard to force effects experienced by the bridges and the effect on the durability and longevity of bridges. A second objective is to compare the effect of heavier trucks to the effect of doubling the number of heavy vehicles under the present legal weight restrictions.